Balanced throttle-valve



No. 625,555. Pafented May 23, I899.

w. J. HEALY.

BALANCED THROTTLE VALVE.

(Application filed Oct. 25, 1898.)

(No Model.)

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UNITED STATES PATENT OFFICE.

' IVILLIAM J. HEALY, OF SUSQUEIIANNA, PENNSYLVANIA.

BALANCED TH ROTTLE-VALVE.

SPECIFICATION forming part of Letters Patent No. 625,555, dated May 23,1899 Application filed October 25, 1898. Serial No. 694,501. (No model.)

T 0 all whom it may concern:

Be it known that I, WILLIAM J. HEALY, a citizen of the United States,residing in Susquehanna, in the county of Susquehanna and State ofPennsylvania, have invented certain new and useful Improvements inBalanced Throttle-Valves, of which the following is a specification.

My invention relates to an improvement in throttle-valves.

The object is to attain simplicity of construction and operation,andmore particularly to provide a valve in which only a single joint isemployed as contradistinguished from the two joints universally employedin valves of this character, thus avoiding the objection of fitting twojoints to their seats, so common in throttle-valves hitherto in use.

With this object in View my invention consists in certain novel featuresof construction and combinations of parts, which will be hereinaftermore fully described, and particularly pointed out in the claims.

In the accompanying drawings, Figurel is a vertical longitudinal sectionthrough the valve chamber and seat. Fig. 2 is a plan view. Fig. 3 is aside elevation of the valve. Fig. l is a plan view of the valve; andFig. 5 is a view in side elevation of the valve, valvechamber, andconnections.

The letter g represents the usual steam pipe or chamber, and h anannular ring cast in the center of the valve-chamber, a suitabledistance within the latter, so that the spacej is formed outside of it,and it being held in place at the top by means of several ribs orspacing devices 2'. These ribs and also the upper edge of the ring andthe metal above are beveled at the top to form a seat for the valve.

The letter d indicates the valve, it having a conical seat 0, adapted tofit the seat at the top of the valve-chamber. The valve is also providedwith three or more guiding-ribs f, which center it in the ring h in itsvertical movements.

Connected with the lower end of the valve is a stem at. A bell-cranklever b, pivoted in suitable position, is pivotally connected with thisstem, and a rod 0, pivotally connected with the other end of thebell-crank lever, extends to a convenient position to be operated.

The device affords a perfectly-balanced throttle valve, because thepressure of steam on top of the valve is due to the difference in thediameters at the top and bottom of the conical portion of the valve, andthis difier ence can be as small as desired.

The fact that the valve has but one seat renders the task of fitting itand making a perfectly steam-tight joint an easy one, which is a decidedadvantage over the valve in common use, because of the fact that theyemploy two valve-joints located frequently several inches apart, thusmaking it most difficult to fit avalve so that it will not leak steamand will stay tight. By myimprovement this objection is obviated.

. nected with the valve and engaging the walls of the ring formaintaining its central position.

2. The combination in a throttle-valve with a valve-chamber having anannular ring therein with a surrounding chamber, said ring andvalve-chamber having spacing devices and a tapering seat formed at thetop into which the chamber outside of the ring opens, of a valve havinga conical portion adapted to fit the seat and guiding-ribs fitting thewall of the ring for centering the valve and means for raising andlowering the valve.

3. The combination with a valve-chamber having an annular ring thereinwith a sur- ICO

